Visor for a helmet



FIG. 1 is a top plan view of a visor for a helmet showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a visor for a helmet, as shown. 